Toddler refusing to walk

MRI of posterior fossa ependymoma
Sagittal T1 MRI without contrast of the brain (left) shows an isointense mass filling and distending the fourth ventricle and exiting it and extending beneath the foramen magnum into the spinal canal. The axial T2 MRI (right) shows the hyperintense mass surrounding the left side of the cervical spinal cord.

The diagnosis was ependymoma.